Friction-clutch.



PATENTED MAY 15, 1906.

G. STAHL.

FRICTION CLUTCH.

APPLICATION FILED DEG.14, 1904.

2 SHEETSSHBET 1.

I Elmvemtoz Witness attouww V No. 820,446. PATENTED MAY 15, 1906. G. STAHL.

FRICTION CLUTCH.

APPLICATION FILED DEG.14.1904.

2 SHEETS-SHEET 2,

PATENT OFFICE.

UNITED stra r is GEORGE STAHL, OF DAYTON ,OHIO, ASSIG-NOR OF ONE-THIRD TO WILLIAM P. COFFMAN AND ONE-THIRD TO JOHN I. COFFMAN,

OF DAYTON, OHIO.

FRICTION-CLUTCH.

Specification of Letters Patent.

Patented ma 15, 1906.

Application filed December 14, 1904; Serial No. 236,783.

To all whom it may concern:

Be it known that I, GEORGE STAHL, a citizen of the United States, residing at Dayton, in the county of Montgomery and State of Ohio, have invented certain new and useful Improvements in Friction-Clutches, of which the following is a s ecification.

My invention re ates to improvements in friction-clutches and the object of the invention is toprovide a simple and effective friction-clutch adapted for use with any form of power-driven machinery, particularly lathes, shaping-machines, and devices of that character where it is desired to start and stop the machinery quickly.

My invention consists in the constructions and combinations of parts hereinafter described, and set forth in the claims.

In the accompanying drawings, Figure 1 is a side view of a device embodying my invention. Fig. 2 is a partial sectional view of the same. Fig. 3 is a side elevation of some of the operating parts removed. Fig. 4 is a side view showing parts somewhat modified from those shown in Fig. l andin reverse order. Fig. 5 is a detail view in perspective, showing the construction of some of the operating parts.

Like parts are represented by similar letters of reference in the several views- In carrying out my invention I employ an outer power-driven wheel or pulley a, which is mounted in a well-known manner to turn loosely on a shaft 0/ The outer peripher of this wheel a may be in the nature of a pu ley orband-wheel or adapted to be driven in any well-known manner. It is preferably provided with'an inner hub a and a suitable number of arms (1 which connect theouter rim to said hub. This hub and the arms are preferably offset slightly from the center of the rim, and the rim is turned out at one side, as shown in Fig. 2, to receive the inner fric-' tion device I). This consists of an outer rim 1) and an inner hub b connected by a suitable number of arms If. These pa'rts'that is, the rim, hubs, and arms-are preferably cast integrally, and the outer rim is split transversely, as shown at 1), adjacent to each of the arms, and from this cross-slot there extends a circumferential slot 1), which extends throu h the rim, leaving a projecting ortion b, which extends from a point near t e hubarms for a distance equal to the length of the longitudinal slot b This projecting portion 1) is formed at its extremity with an inwardlyextending lug b. I

That portion of the rim which lies adjacent to the arm b or on the opposite side of the slot 1) is also provided with an inwardly-proj ecting lug b and between these lugs there is formed a depression or socket b in front of the hub-arm 6 Within this depression or socket there is pivoted an operating-arm c. This arm is cam-shaped at its outer end and fits between the projections b and b and is adapted as the arm is moved to force the free portions of the friction device outwardly, so as to contactwith the inner periphery of the outer rim (1. The operating-arms c are curved in the direction of the periphery of therim and thence inwardly, so as'to stand opposite the main shaft a, the friction device I) being secured to said shaft. The inner ends of the operating-arms c are provided with adjustable contacting parts 0, adapted to be engaged by a cone-shaped hub or collar 0 which may be forced between these contact-v ing parts, and thus move the arms outwardly sufficient to cause the free portions of the inner friction device to impinge a ainst the inner periphery of the outer whee or pulley. It will be seen that when the conical collar 0 is forced between the operating-arms they will be moved outwardly and cause the free eri her and firml en a e it, causing the gullgy ari d shaft to r evoli re together. When the collar is moved from those arms, the resiliency of those parts will cause them to resume their normal positions, and thus free said pulley. The adjustable contacting devices in the ends of the operating-arms permit the same to be adjusted so as to secure the proper degree of pressure on the impingparts of the clutch device to contact with the periphery parts on each side of said transverse slot in opposite directions to cause them to impinge the outer revolving part, substantially as described.

2. The combination with the Wheel or pu1- ley, of the inner friction device having a rim split transversely in one or more places and having a circumferential slot e'xtending to a point adjacent to Where said rim is split transversely, a depression or socket between the free ends oftherim-sections formed by said longitudinal slot, and a pivoted lever located in said depression, and meansfor operating said lever, substantially as and for the purpose set forth.

3. In a friction device, an outer clutch member, an inner clutch member within the periphery of said outer. clutch member, the ofsaid inner clutch member being divided y transverse slots into a plurality of segments, a tongue formedon each of said segments by the intersection of a circumferential slot in each segment with one of said transverse slots, and means for forcing said tongues outward to frictionally engage said 2211123161 clutch member, substantially as specie I 4. The combination with the outer wheel or pulley havin a hub offset as set forth, of an inner device located Within said wheel consisting of a rim split transversely and circumferentially, pivoted operating-arms to engage the rim-sections formed by said transverse and longitudinal splitting, and a sliding member adapted to contact With the inner ends of said crating-levers as set forth.

he combination with the outer pulley or wheel, of an inner friction device having a transversely-split rim, operatin -arms adapted to move the sections of sai rim on each side of said split, said operating-arms extending inwardly and provided with adjustable contacting devices, and a sliding member adapted to engage with said contacting de'- vices, as and for thepurpose specified.

6. The combination with a shaft and pulley turning loosely thereon, a friction device secured to said shaft consistin of a rim fitting within the rim of said pu ley and split transversely and circumferenti ally, operatingarms to en age the sections of said mm on each side 0 said split, adjustable contacting devices inthe ends of said arm, and a movable member on said shaft adapted to be moved to and from said arms and contact with the same, substantially as and for the purpose specified. I o

In testimony whereof I have hereunto set my hand this 9th day of December, D.

GEORGE STAHL.

' Witnesses:

F. MAUDE Hooves, THOMAS ADKINS. 

